The Siemens 6EP3321-7SB00-0AX0 is a SITOP PSU8200 series switched-mode power supply delivering a rated 24 V DC at 2.8 A typical output, with a DC input range of 110–275 V and AC input 120–240 V at 47–63 Hz. It snaps onto a standard DIN rail EN 60715 35×7.5/15, making it a drop-in replacement in most control cabinets. The output is safety extra-low voltage (SELV) per EN 60950-1, which simplifies panel wiring for control circuits and reduces isolation requirements downstream.
This unit carries cULus listing under UL 508 and CSA C22.2 No. 107.1 (File E197259), plus cCSAus to CSA C22.2 No. 60950-1 and UL 60950-1. CE marking and EAC approval are confirmed. It is also rated NEC Class 2 per UL 60950-1/UL 1310, which matters for installations where the power-limited circuit classification avoids conduit requirements for the load side. No ATEX, IECEx, or UL hazloc approval — this unit is for general-purpose industrial environments, not explosive atmospheres.
Mounts by snapping onto DIN rail EN 60715 35×7.5/15. Required free space above and below the unit is 50 mm each; no clearance needed on the left or right sides. This 50 mm vertical clearance is for natural convection cooling — the unit is rated for operation at -25 to +70 °C with natural convection. If you stack units or enclose them tightly, derate or add forced air. The housing is IP20, so it's suitable for clean indoor panels only.
Feeder Protection and Wiring
The input requires a circuit breaker sized between 4 A characteristic C and 16 A characteristic C, or 6 A characteristic B to 16 A characteristic C, or a specific Siemens 3RV2011-1EA10 (set to 4 A) or 3RV2711-1ED10 (UL 489). Input terminals (/+, L2/N/-, PE) accept 0.5–2.5 mm² single-core or finely stranded wire via PushIn connectors; output terminals (+1, -1, -2) use the same PushIn style for 0.5–2.5 mm². Integral fuse protection is rated at 3.15 A.